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d in (-oo:+oo)
(3.141*d)/0.136 = 18 // - 18
(3.141*d)/0.136-18 = 0
23.09558824*d-18 = 0 // + 18
23.09558824*d = 18 // : 23.09558824
d = 18/23.09558824
d = 0.77936963
d = 0.77936963
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